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茶葉 收穫後 製茶前 經過時間 및 溫度가 製品의 品質에 미치는 影響
김주희(J.H.Kim),박장현(J.H.Park),김정운(J.W.Kim),신길호(G.H.Sin),최형국(H.K.Choi),김선우(S.W.Kim) 한국차학회 1997 한국차학회지 Vol.3 No.1
The effects of storage time and temperature of fresh leaves were investigated on the quality of made tea. The contents of total nitrogen tannin, chlorophylls, total amino acid and caffeine were decreased with increasing storage time and stroage temperature. Shape of green tea was better at high temperature in storage and long stroage time. Color of green tea extracts was better in short storage time from plucking to precessing of fresh tea leaves. When fresh tea leaves were stored for 9hr at 5˚C and for 3hr at 25˚C(room temperature), color of green tea extract, flavor and aroma were good. Optimum storage conditions of fresh tea leaves before processing were storage for 9hr at 5˚C or for 3hr at 25˚C.
서영성(Y. S. Suh),이정열(J. Y. Lee),김용환(Y. H. Kim),김선우(S. W. Kim) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_1
Virtual manufacturing applications to the structural analysis of the sheet-forming parts were carried out. The structural analysis were performed consecutively after the forming simulation. The crashworthiness analysis of an S-rail and the stress analysis of a motor housing were taken as model problems. In both cases, taking account of formed effect such as sheet thickness and residual stresses led to some different results which may not be negligible.
김주희(J.H, Kim),김정운(J.U, Kim),신길호(G.H, Shin),최형국(H.K, Choi),김선우(S.W, Kim) 한국차학회 1997 한국차학회지 Vol.3 No.2
For cutting in vitro, culture conditions of tea plants, monthly contamination rate, selection of disinfectants and infectant exposure time, were investigated. Monthly contamination rates were 12% in May, 15% in Feburuary, 32% in November and 37% in September in vitro conditions. Therefore, it was considered that optimum cutting time was from March to April. The disinfectant of 95% ethanol and 7--8% CaOCl treated was heavily contaminated by 8~9% than 95% ethanol and 25% NaOCl treated by 3% but in the latter case, survival rate was reduced and the disinfective degree was reduced in low concentration. Contamination rates on disinfectant exposure time were 10~16% in the 95% ethanol and CaOCl treated for 15~20min and decreased by 9~11% in the 95% ethanol and 25% NaOCl for 15~20min. but necrosis rate of the latter was 18~79% and survival rate was reduced. The optimum disinfection conditions in vitro culture tea plants are as follows ; after dip plant in the 95% ethanol for 3~5 seconds, disinfect by 7~8% CaOCl treated for 15~20min. and rinse in sterilized water, 3~5 time repeatly.